GNU Radio 2.x: gr_simple_correlator.h Source File

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# gr_simple_correlator.h

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    00001 /* -*- c++ -*- */
    00002 /*
    00003  * Copyright 2004 Free Software Foundation, Inc.
    00004  *
    00005  * This file is part of GNU Radio
    00006  *
    00007  * GNU Radio is free software; you can redistribute it and/or modify
    00008  * it under the terms of the GNU General Public License as published by
    00009  * the Free Software Foundation; either version 2, or (at your option)
    00010  * any later version.
    00011  *
    00012  * GNU Radio is distributed in the hope that it will be useful,
    00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00015  * GNU General Public License for more details.
    00016  *
    00017  * You should have received a copy of the GNU General Public License
    00018  * along with GNU Radio; see the file COPYING.  If not, write to
    00019  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00020  * Boston, MA 02111-1307, USA.
    00021  */
    00022
    00023 #ifndef INCLUDED_GR_SIMPLE_CORRELATOR_H
    00024 #define INCLUDED_GR_SIMPLE_CORRELATOR_H
    00025
    00026 #include <gr_block.h>
    00027
    00028 class gr_simple_correlator;
    00029 typedef boost::shared_ptr<gr_simple_correlator> gr_simple_correlator_sptr;
    00030
    00031 gr_simple_correlator_sptr gr_make_simple_correlator (int payload_bytesize);
    00032
    00039 class gr_simple_correlator : public gr_block
    00040 {
    00041   static const int OVERSAMPLE = 8;
    00042   enum state_t { ST_LOOKING, ST_LOCKED };
    00043
    00044   int            d_payload_bytesize;
    00045   state_t        d_state;
    00046   int            d_seqno;
    00047   unsigned char *d_buf;
    00048   int            d_bufsize;
    00049   int            d_bi;                  // buffer index
    00050   unsigned char *d_pktbuf;
    00051   int            d_best_fit;            // [0,7]
    00052   unsigned int   d_shift_reg[OVERSAMPLE];
    00053
    00054   friend gr_simple_correlator_sptr gr_make_simple_correlator (int payload_bytesize);
    00055   gr_simple_correlator (int payload_bytesize);
    00056
    00057   void enter_locked ();
    00058   void enter_looking ();
    00059
    00060  public:
    00061   ~gr_simple_correlator ();
    00062
    00063   int general_work (int noutput_items,
    00064                     gr_vector_int &ninput_items,
    00065                     gr_vector_const_void_star &input_items,
    00066                     gr_vector_void_star &output_items);
    00067 };
    00068
    00069
    00070 #endif /* INCLUDED_GR_SIMPLE_CORRELATOR_H */